Strapya World is carrying a number of cases for iPhones that, depending on taste (or whether you subscribe to the need for a case at all), might be worth looking into.

There are seven in total: four Sega cases, two Final Fantasy cases and a retro Famicom cover. The Final Fantasy ones are made of silicon and are from Advent Children, while the Famicom one is a "hard case".

My faves are the Sega covers, though, especially the three designs for the Mega Drive, Saturn and Dreamcast.